酸化是特低渗透砂岩油藏的重要增产措施,若酸液体系使用不当,会对储层造成敏感性伤害.为此,以吐哈盆地鄯善油田三间房组砂岩储层为例,通过XRD衍射分析、扫描电镜、储层敏感性评价实验及现场资料整理等方法,研究储层敏感性特征及损害机理,并研发一种酸化增产液,该酸化增产液可与土酸组合使用,提高酸化效果.研究表明:三间房组储层岩石类型以长石岩屑砂岩为主,黏土矿物以高岭石和蒙脱石为主,属于高黏土矿物储层;储层物性整体表现为低孔特低渗特征,原油为轻质原油,油藏为正常地层压力的未饱和油藏;储层具有中等偏弱速敏、碱敏、水敏、盐敏以及弱酸敏特性;增产液与土酸组合酸液体系可溶蚀大孔隙、微孔隙等多种尺度孔隙后形成孔隙网络系统,可使目标储层岩心渗透率最大提高至原有渗透率的2.68倍.现场应用效果显著,与酸化前相比,平均单井日产油量增加1.29 t/d.研究成果可为特低渗砂岩油藏酸化增产提供技术支持.

新疆油田目前存在大量的针对高凝油、稠油凝结卡堵井、及其它复杂油水井的清蜡解堵作业,数据显示,单结蜡油井就超过总油井数的70％[1],传统机械清蜡、热洗清蜡、提出生产管柱进行地面清蜡等手段效率低,对油气层伤害大.由此将连续油管与高压水射流工艺相结合,形成了连续油管管内清蜡解堵工艺,其作业时间短、成本低、清蜡彻底、对油气层伤害小,在油井、气井中应用多次均取得较好效果.

With the development of the coiled tubing operation machine,the coiled tubing drag ab-rasive perforating and annulus fracturing technique was used successfully in fields.Because of the disadvantages of downhole tools and ground process,the technology can not achieve a wide-range popularization and application in the domestic.High accuracy requirements of drag abrasive perfo-rating of target layer restricted the large scale promotion application of the technology.Thus,a set of wireless coupling locator used in coiled tubing drag abrasive perforation of multistage fractu-ring was designed.It was modular designed,easily-repaired,and for general purpose.According to suspending weight change generated when the coupling locator go through the casing coupling can accurately judge the actual location of the downhole tool within the well.The well test and field application showed that the coupling locator can meet the construction requirements.

Fixed-point jet acid fracturing on coiled tubing is one new hydraulic fracturing technology which integrates multiple techniques of jet perforating,hydraulic fracturing,and hydraulic isolation.Compared with ordinary hydraulic fracturing,this new technology has such characteristics like simple operation sequence,short construction period,safe and reliable operation process.Through the application of fixed-point jet acid fracturing to three horizontal wells in Hotan River Gas Field of Trim Basin,good effects are obtained,with the output of single well increasing obviously.